An unusual method for welding dissimilar materials is being investigated at Novosibirsk State Technical University. The unique technology allows you to connect parts that previously could not be welded using other methods.
NSTU-NETI in cooperation with the Institute of Hydrodynamics named after M. A. Lavrentiev SB RAS achieved the connection of heterogeneous materials using a special method. Previously "unfriendly" alloys were combined using a technology based on high-speed impact. The scientists used a strong electromagnetic field to accelerate the workpieces to several hundred meters per second.
In magnetic pulse welding, the contact time of the workpieces ranges from units to tens of microseconds. With this approach, brittle chemical compounds do not have time to form between the parts to be welded and a high-strength weld is formed.
According to Ivan Bataev, Head of the Research Laboratory of Physico-chemical Technologies and Functional Materials, Professor of the Department of Materials Science in Mechanical Engineering at NSTU-NETI, a unique technology based on high-speed plate collision is used to connect dissimilar materials. "Two blanks collide at tremendous speeds, hundreds of meters per second, and under certain conditions of impact, a strong connection occurs between them," the scientist said.
Explosives are often used in industry to perform this type of work. The blanks are literally accelerated by an explosion, after which they collide, and the desired connection is obtained. However, this method is dangerous and noisy, and it also requires special conditions: special landfills and licenses are needed.
Magnetic pulse welding compares favorably with explosion welding. It does not require special large areas and work with dangerous substances, is environmentally friendly and fast in time. But the most important thing is that the compounds that can be obtained are particularly strong. But the most important thing is that the compounds that can be obtained are particularly strong.
Researchers have already combined aluminum with steel using magnetic pulse welding. Researchers have already combined aluminum with steel using magnetic pulse welding. "The fundamental question is of interest: how is the connection formed between two completely different materials?" said Ivan Bataev.
Such welding is also of interest in practice. It is useful in areas such as automotive, electronics, and instrument engineering and is often used to connect pipes made of dissimilar materials wherever a wide range of materials needs to be welded with maximum reliability.